Figure 1.

Accumulation curves of 22 habitats. Each line represents the accumulative richness from all subjects. All the reads
were included in the analysis to have a full view of the genera revealed by the HMP
and other datasets. At the genus level, oral, vaginal, and stool habitats become asymptotically
flat at the current sampling depth and sampling efforts. More subjects are needed
to reach the saturation for skin and skin-associated habitats.